Found this texture glitch regarding... poop. So my character pooped, creating the item poo, likely because I ate snowberries. If you smack it against the floor it creates a slippery poop surface, that from what I had at the time (just the sponge) I couldn't remove.
Now that's fine, but when I left the game and came back, the brown poo surface turned into the image you see now, a bright green square. It's not slippery anymore, but I can't seem to remove it.
[Edit, throwing water onto the green square gets rid of it for anyone else who gets it.]
